How to Restore iPhone Touch ID With Home Button Flex Repairing

Blake Nov 30, 2017

iPhone touch ID not working issue has been a sticky business for repair technicians for a long time. What’s more, iPhone touch ID of iPhone 6 and later versions are bonded with CPU(iPhone 6s home button not working), and Home Button replacing by users has a destructive effect on touch ID fingerprint sensor function. The fact is that about 80% of iPhone Touch ID failures are caused by damaged home button flex. Well, this time REWA come up with a new solution regarding the damaged home button flex. Check it out by yourself now.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Restore iPhone Touch ID With Home Button Flex RepairingPower on and test. "Unable to activate Touch ID on this iPhone". Press Home Button, the returning function is normal.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Disassemble the phone and remove the display assembly. First of all, check the logic board connector J2118 for moldy condition and dry Joint. Everything is fine.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Then, measure the resistance between J2118 and grounding. The value is also normal.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Take down the Home Touch Sensor Assembly and check the home button flex cable. There are obviously broken traces on the flex cable.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Preliminary judgment - Touch ID malfunction is caused by fractured flex cable circuit. We can fix the problem by replacing the fractured section with a new length of the flex cable.Pry up the back plate with Tweezer and Soldering Iron. Cut the fractured part from the flex cable with Sculpture Knife.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Scrape out the flex cable circuit. Be careful not to cut the circuit off.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Apply some BGA paste flux to the flex cable and then solder tins with Soldering Iron. Clean with PCB Cleaner after cooling.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Prepare a new Home Touch Sensor Assembly.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Pry up the back plate of the new Home Touch Sensor Assembly. Cut a length of flex cable from the new Home Touch Sensor Assembly (allow for some adjustment in length of the cut cable).



How to Restore iPhone Touch ID With Home Button Flex Repairing


Fix the newly cut cable with double-sided adhesive. Then, scrape out the newly cut flex cable circuit. Be careful not to cut the circuit off.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Apply some BGA paste flux to the newly cut flex cable. Then solder tins with Soldering Iron. Clean with PCB Cleaner after cooling.



How to Restore iPhone Touch ID With Home Button Flex Repairing


CCut out the excess parts of the newly cut flex cable. After that, apply 460 Glue to the bonding part and adhere the two cables carefully. Pay attention to the aligning position.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Once cables are fixed, apply some BGA paste flux and solder flex cables with Soldering Iron. Be careful with bridging and disturbed solder condition.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Clean with PCB Cleaner after cooling. Remember to check the circuit for bridging and disturbed solder.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Get the Home Touch Sensor Assembly mounted on the screen. Then buckle the display assembly to the logic board.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Power on and run Touch ID function test. Touch ID back to normal.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Take down the display assembly after test and take out the Home Touch Sensor Assembly. Prepare another length of the cable. And then adhere the cable to the previous bonding part.



How to Restore iPhone Touch ID With Home Button Flex Repairing


To further secure flex cables, solder with Soldering Iron. And then secure the back plate with Glue carefully.



How to Restore iPhone Touch ID With Home Button Flex Repairing


Get the Home Touch Sensor Assembly mounted on the screen. Buckle the display assembly to the logic board. After that, power on and test. The phone works with normal Touch ID function.



How to Restore iPhone Touch ID With Home Button Flex Repairing


For more details on restore iPhone Touch ID with Home Button flex repairing, please go to REWA YouTube channel.




Tools Used


Maintenance Platform

Soldering Iron

Screwdrivers

Plastic Pry Bar

Anti-static Wrist StrapApple

iPhone 6 Home Button With Flex Assembly


You May Also Read:


iPhone 6 Error 9 CPU Repair Without BGA Reball

iPhone 6 No Service Hardware Fix Solution

How To Fix A Water Damaged iPhone 6

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